Cardiac stimulation electrodes, delivery devices, and implantation configurations
Some embodiments of an electrode delivery system may be used to deliver a plurality of wired electrodes into one or more chambers of the heart. In particular embodiments, the plurality of wired electrodes may be delivered into a heart chamber through a single guide sheath device. Such a system may be used to deliver one or more wired electrodes to inner wall of the left atrium, the left ventricle, or both.
1. A system, comprising:
a cardiac stimulation wired electrode assembly, comprising:
a fixation device configured to be driven in a direction of a longitudinal axis of the fixation device to securely implant the fixation device into an interior wall of a heart chamber, the fixation device comprising a conductive helical coil member having a piercing tip at a distal end and an integrally formed cross bar extending inward at a proximal end of the coil member toward the center of the coil member to form a handle; and
at least one insulated wire including a first end that is attached directly to the conductive material of the fixation device at an attachment point that is laterally offset from the longitudinal axis of the fixation device, and including a second end that is connectable to an implantable pulse generator device; and
wherein the fixation device handle is confined within a lateral profile of the fixation device, the handle member configured to be releasably retained by a deployment device at a first location, and wherein the insulated wire is laterally offset from the deployment device and the first location when the handle member is releasably retained by the deployment device at the first location.
2. The system of claim 1 , wherein the insulated wire includes an outside diameter of less than about 0.010 inches.
3. The system of claim 2 , wherein the insulated wire has an outside diameter of about 0.007 inches.
4. The system of claim 3 , wherein the insulated wire is coated with an anticoagulant.
5. The system of claim 1 , wherein the fixation device comprises a helical tine that extends around the longitudinal axis.
6. The system of claim 1 , wherein the insulated wire is connectable to the implantable pulse generator device so that electrical pulses are deliverable through the fixation device and to at least a portion of the heart chamber wall.
7. The system of claim 1 , wherein the fixation device comprises a radiopaque material configured to permit viewability of at least a portion of the fixation device using a medical imaging technique.
8. The system of claim 1 , wherein the fixation device comprises at least one of a platinum-iridium alloy or a gold-plated stainless steel material.
9. The system of claim 1 , comprising:
a guide sheath device including a distal end and a guide conduit extending therethrough;
an inner sheath device including a distal end configured to pass through the guide conduit and including an inner conduit extending therethrough;
a deployment device configured to direct at least the wired electrode assembly through the inner conduit into a heart chamber; and
wherein the inner sheath device has a lateral width smaller than the guide conduit such that the inner sheath device is configured to slide through the guide conduit and configured to direct a second wired electrode assembly toward a second tissue site in the heart chamber while a first insulated wire is located in the guide conduit laterally outside the inner sheath device, the first insulated wire attached to a previously delivered first wired electrode assembly.
10. The system of claim 9 , wherein the deployment device includes an elongate body, a distal end, and a detachment mechanism at the distal end configured to detachably couple with at least one of the first or second wired electrode assemblies.
11. The system of claim 10 , wherein the detachment mechanism at the distal end is configured to detachably couple with a respective first or second handle member included as a portion the first or second wired electrode assemblies.
12. The system of claim 9 , wherein the deployment device is configured to transmit a rotational force to the wired electrode assembly.
13. The system of claim 9 , wherein the deployment device is configured to direct at least a portion of the first or second electrode assemblies to penetrate through an endocardium and into a myocardium.
14. The system of claim 13 , wherein the deployment device is configured to direct a respective first or second helical tine included as a portion of a first or second electrode assembly through the endocardium and into the myocardium.
15. The system of claim 9 , wherein the inner sheath is configured to maintain a longitudinal axis of at least one of the first or second wired electrode assemblies in an orientation substantially perpendicular to a plane defined by the heart chamber wall at a respective first or second tissue site.